通过对组合管柱的受力分析，依据推导的公式，找到了一种采用图板进行油管柱最大下入深度和强度校核的方法。

This paper deduced equation by analyzing strength endured by tubing string, based on formula, taking advantage of graphical method checkout the maxim setting depth and strength.

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结果表明，受压扭组合作用的有重管柱的屈曲构型为上疏下密的螺旋曲线。

The results showed that the buckling configuration was helical curve for the gravitational tubular under the axial compressive force and torque.

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